非圆表面的加工通常采用靠模仿形机构来完成。除用专用凸轮加工机床外,采用夹具加工,一般其结构比较复杂,夹具制造也困难,成本较高。本文介绍一种简单方便的靠模式车床夹具,用于曲率半径变化不大的非圆类工件的车削加工。工件是由四段圆弧组成的椭圆形端盖类零件(图1)。众所周知,当工件加工面曲率无变化时,如车削圆棒料时,刀具后角在加工过程中始终不变,为一常量,而非圆表面在加工过程中刀具的实际后角为变 Non-circular surface machining is usually done by imitation-shaped mechanism. In addition to using special cam machining machine, the use of fixture processing, the general structure is more complex, fixture manufacturing is also difficult and costly. This article describes a simple and convenient by the mode lathe fixture for small radius of curvature of non-circular workpiece turning. The workpiece is composed of four sections of oval-shaped cover parts (Figure 1). As we all know, when the curvature of the workpiece surface without change, such as turning the bar, the tool after the corner in the process of constant, as a constant, rather than the surface of the circle in the process of cutting the actual clearance for the variable